Full Self Measure Video
Sleeve Measure Video
Shoulder Only Video
Shoulder measurements seem to be tricky, so hopefully this helps. Measurement would be "seam to seam" on a well fitting shirt (key here is WELL fitting, not too narrow or wide). Most guys will have their shoulders 7easure anywhere in the range of 16" - 18" across the front, depending on your height and overall build.
The back shoulder is done the same as the front...generally the back shoulder is .5" - 1" wider than the front, for reference. Some guys can measure the same as the front, but it's more common for the back to be slightly wider. If you cannot get an accurate back measurement, the front can be used to proportionately guesstimate the back, by adding 1" to the front.
Self measure is not as difficult as one might think. Here are some general tips to keep in mind:
-Do a few sets of measures. Check each set with the others to make sure you are getting the same numbers. A discrepancy less than .5" is ok (zero is ideal), but any more than that and it can affect the final outcome of the garment.
-The neck base is the bottom of neck, where your neck attaches to shoulders, measured around. Usually the neck base is .5" - 1" larger than your actual neck circumference.
-When measuring the chest, measure directly under armpit and look straight ahead. Looking downward (as in when you try to do it without assistance, by yourself) can result in a smaller (inaccurate) number. Best to have someone help. Stand normally, don't take a deep breath in or out as that can vastly affect the true measurement.
-When measuring the trouser waist (2" below navel), wrap the tape measure around as tight as you would want your trouser to be. If you have any belly flab, the trouser waist is probably going to be smaller than your actual on body measurement so keep that in mind. Constrict the measure tape as much to retain comfort.
-The inseam needs to be taken off an existing pair of trousers for most accurate measure (and adjusted as needed if it's too long/short). This is the one measurement that you many will want to fine tune after getting the suit, since where you end up wearing the trousers on your waist can affect the leg length. Fortunately this is the quickest, easiest and cheapest alteration to do. Every trouser has about 2" of fabric to let down if needed.
-Once again, if you are not sure how long the sleeve should be, please get NONFUNCTIONAL cuffs for easy alteration and do the functional cuffs for a future garment.
If you want to self measure your jacket sleeve for functional cuffs (where the buttons open/close at the sleeves) you can try to measure it yourself, but any erroneous measurement that requires alteration will be at your expense. If you need up to an inch longer on functional cuff sleeves, it is possible to do, and an extra button/buttonhole may be needed depending on how much you lengthen. If you need it shorter, about .25" can be done fairly easily, anymore than that and you may need to have new sleeves made, again at your expense. But if you decide to take a measurement for surgeon (functional) cuffs here is how:
1. you will need an existing jacket that fits well (if the sleeves are too long/short you will need to accomodate this adjustment in the measurement)
2. hang the jacket on a hanger so it is draping as naturally as possible (pics show measurement on table but I dont recommend this if you haven't done this before)
3. start measurement at the top of sleevehead
4. go all the way down to bottom along the longest route
5. to keep it in perspective, an average person up to 5'6 might have a 22-23" sleeve. 5'7-5'10" can range from 23"-25". 5'11" and taller can range from 25" - 27"
Again, to reiterate, any mismeasurement of sleeves and subsequent tailoring required afterward on functional cuff jackets will be done at wearer's cost, so make sure you measure as correct as possible!